Container and method of making it



1946- v. A. RAYBURN 2,3,681

' ccu'mmsn AND warrior) or MAKING IT Filed Deb. 16, 1942 //v VENTOE MA E4 vauwv outrun stares ATENT QONTAINER AND METHOD OF MAKmG HT Vincent A. Rayburn, Baltimore, Md., 'assignor to Western Electric Company, Incorporated, New York, N. Y., a corporation of New York Application December 16, 1942, Serial No. 469,249

orrlca absorb moisture.

R to Claims.

This invention relates to containers and methods of making them, and more particularly to containers for retaining corrosive liquids and methods of making such containers.

is-difiicult to obtain a good bond between the rubber sheets and the metal tank and adhesives used to securethe rubber sheets to the tank Furthermore, the rubber sheets themselves absorb moisture and so tend to blister and warp and thus tend to become disengaged from the walls of the tank. Then, too, rubber is, at present, in great demand, and is unavailable for many purposes for which it was heretofore commonly used.

Objects oij thisjinvention are to provide new and improvednon'tainem m retaining corrosive liquids and to provide novel and efiective methods of. making such containers.

- fitted together.

to the inner walls thereof by a layer i-2 f adhesive. The body it preierablyis made" of a suitable metallic material such as steel or copper,

although materials other than metal may be A large variety of corrosive liquids, such as 5 employed. strong acids, strong bases, and corrosive salts, are The lining ii is-made of a thermoplastic comemployed as electrolytes in electroplating procposition containing reclaimed rubber, clay, hard esses. The tanks employed for retaining these bitumen, resin and paramn. In making up this electrolytes are subject tocorrosion both from composition, the ingredients are thoroughly mixed the electrolytic action of the electrolytes when in in a Banbury mixer or rubber mill and are an electric potential is impressed upon the tanks,- formed by calendaring into non-porous pliable and from the purely chemical action of the elecsheets which are almost unafiected by corrosive trolytes. Since such tanks are generally made of liquids, such as those generally employed in elec metal, it is necessary to line them with some troplating solutions.

material that has a low conductivity factor and id The lining ll may be prefabricated to fit the is unaffected by the corrosive liquids to be reinside of the body it and thus provide a contained therein. In the past, rubber sheets have tinuous seamless protective shield, or a sheet or n u e el plating tanks because sheets of the thermoplastic material'may be cut rubber is a well known insulating material and is to lit the inner surfaces of the body ifl. Since not afiected chemically by most electrolytes. It so it is more economical to produce sheets of the thermoplastic mixture than it is to produce prefabricated linings of such material, and since no particular advantage is gained by prefabricating the lining Ii, the lining II is usually composed of several sheets of the thermoplastic material In'Fig. 1, the lining ii is produced from a single sheet of thermoplastic material, so that there are only four seams i l in the entire lining.

Although the proportions of the thermoplastic material may be widely varied, it is preferable to mix the ingredients in proportions falling within the following ranges:

' Per cent In general, the invention contemplates the provision of a container for retaining corrosive liqfifclaimed rubber 2g uids, such container having a hollow body and bit No 20 a'solid lining covering the inside of the body -e- 2m 6 to protect the body from liquids retained-therein, P m 1 t 5 Said lining comprising a composition consisting am n o of reclaimed rubber, clay, hard bitumen, resin and paraflln.

Other features and advantages of the invention will become apparent from the following detailed description thereof when read in conjunction with the accompanying drawing, in which Fig. 1 is a perspective view of an electroplating tank embodying the invention, and

Fig. 2 is an enlarged sectional view thereof taken on line 2-2 of Fig. 1.

In the particular embodiment of the invention shown in the accompanying drawing, a tank 'for-containing a corrosive liquid comprises a hollow body I0 having an inner lining ii secured -A particular thermoplastic material that has proved to be especially satisfactory consists substantially of about 40% reclaimed rubber, about 43% clay, about 12% hard bitumen (mineral rubber) about 4% cuma'r resin and about 1% parused herein and in the annexed claims, is in- The adhesive material i2 is preferably a mixtended to mean a refined asphalt product having a viscosity similar to that of heavy molasses.

The thermoplastic material, rosin oil and asphaltic material, aremixed in a heated mixer in such proportions that the adhesive produced may be brushed upon surfaces to be coated, when heated to a temperature of from about 225 F. to about 250 F. A very satisfactory adhesive may be produced by mixing the ingredients in the proportions of about 38% thermoplastic material, about 57% viscous asphaltic material and about 5% rosin oil.

To apply the lining H to the body ill, the body and the lining are separately heated to a temperature of from about 140 F. to about 175 F. The adhesive is heated to a temperature of from about 225 F. to about 250 F. and brushed onto the heated surfaces of the body to which the lining is to be applied. The heated lining is then pressed against the adhesive layer and rolled to force out any air that might have been trapped'between the lining and the adhesive layer. The lining is finally clamped in position so as to hold it in tightly against the adhesive layer and the entire tank is allowed to'cool. The finished tank preferably should not be used for a day or so to permit the adhesive to set firmly.

Tanks protected with a lining of a thermoplastic material such as thatabove described arealmost unaffected by thecorrosive, liquids contained therein, the only apparent eifect being that the lining appears to harden slightly and to" adhere more firmly to the inside of the body Ill. The adhesive, like the lining itself, is impervious to moisture and thus will not absorb water and cause the lining of the thermoplastic mixture to warp away from the body "I. Tanks protected with these linings are particularly ei'fective'for retaining solutions containing fluosilicic acid, such as are used as electrolytes in lead plating baths.

about 30% to about 50% reclaimed rubber, from about 33% to about 53% clay, from about 5% to about 20% mineral rubber, from about 2% to about 6% corner resin and from about 1% to' about 5% paraflln, and a layer of adhesive ma.- terial interposed between the tank'and the lining composed of about 38% of said thermoplastic material and the balance rosin oil and asphaltlc material in the ratio of about 1 to 10.

4. The methodof making containers for corrosive liquids, which comprises coating the inside of a hollow metal body with a layer of an adhesive consisting of about 38% thermoplastic material and the balance consisting of a viscous asphaltic material and rosin oil in the ratio of about 10 to 1, said thermoplastic material consisting of from about 30% to about 50% reclaimed rubber, from about 33% to about 53% clay, from about 5% to about 20% hard bitumen, from about 2% to about 6% cumar resin and from about 1% to about 5% parafiin, and pressing a solid lining made of said thermoplastic material against the layer of adhesive.

5. The method of making containers for corsive about 38% of which consists of a thermoplastic material containing about reclaimed rubber, about 43% clay, about 12% hard bitumen,

The electroplating tank shown in the accompanying drawing is merely illustrative of the invention, and variations in the construction thereof may be made without departing from the invention. Obviously, other suitable carriers may be used in making up the adhesive employed and other suitable adhesives may be substituted for the one described hereinabove.

What is claimed is:

1. In a container for corrosive liquids having a hollow metal body, means to protect the body against corrosion by liquids contained therein, comprising a lining of a solid thermoplastic material consisting of about 40% reclaimed rubber, about 43% clay, about 12% hard bitumen, about 4% cumar resin and about 1% paraflin, and a layer of adhesive material interposed between the body and the lining consisting of about 38% of said thermoplastic material, about 5% rosin oil and about 57% asphaltic material.

2. A container for retaining corrosive liquids which comprises a, metal tank, a lining of solid material covering the inner surfaces of the tank and consisting of from about 30% to about about 4% cumar resin and about 1% paraflln,

' and the balance consisting of a viscous asphaltic material and rosin oil in the ratio of about 10 to 1, and pressing against the layer of adhesive a solid lining made of thermoplastic material substantially identical in composition with the thermoplastic material used in making the adhesive layer.

6. The method of making containers for corrosive liquids, which comprises separately heating toa temperature between about 140 F. and about 175 F. a metal tank and a solid lining made of a thermoplastic material consisting of about 40% reclaimed rubber, about 43% clay,

about 12% hard bitumen, about 4% cumar resin and about 1% paraflln, heating to a temperature of from about 225 F. to about 250 F. an adhesive consisting of said thermoplastic material, rosin oil and viscous as'phaltlc material, applying the hot adhesive to the surfaces of the heated tank to be protected, placing the heated lining over the adhesive coated surfaces of they hollow body, rolling the lining to force any entrapped air from between the adhesive layer and the lining, pressing the lining tightly against'the adhesive layer, and allowing the container thus assembled to cool. 7. The method of making containers for hold ing corrosive liquids, which comprises applying a hot, flowable coating or an adhesive to the inner surface of a metal tank, which adhesive consists of about 38% thermoplastic material, about 57% viscous asphaltic material and about 5% rosin oil, applying over the layer of hot adhesive 0 about 30% to about 50% reclaimed rubber, from about 43% to about 53% clay, from about 5% to about 20% mineral rubber. from about 2% 5 to about 6% cumar resin and from about 1% to about 5% paraflin.

8. The method of making containers for holdingcorrosive liquids, which comprises applying an adhesive to the inner surface of a metal tank, which adhesive consistsv of about 38% thermoplastic material, about 57% viscous asphaltic material and about 5% rosin oil, and applying over the layer of adhesive a solid lining made of a material substantially identical in composition with the thermoplastic material employed in said adhesive, the thermoplastic material employed consisting of about 40% reclaimed rubber, about 43% clay, about 12% mineral rubber, about 4% cumar resin and about 1% parafiln. l

9. A container for retaining corrosive liquids, which comprises a hollow metal body, a. lining of solid material for protecting the metal body against corrosion by the liquids contained therein made of a thermoplastic material consisting of from about 30% to about 50% reclaimed rubber, from about 33% to about 53% clay, from about 5% to about 20% hard bitumen, from about 2% to about 6% cumar resin and from about 1% to about 5% paraflin, and a layer of adhesive material interposed between the body and the lining consisting of about 38% of said thermoplastic material, about 5% rosin oil and about 57% viscous asphaltic material.

10. A container for retaining a corrosive elec-' eral rubber, about 4% cumar resin and about 1% paramn, and a layer of adhesive material interposed between the tank and the lining consisting 20 in the ratio of about 1 to 10.

VINCENT A. RAYBURN. 

